8th Science Ch.5.Coal and Petroleum Solved MCQ type questions

8th  Science CBSE Test paper Solved Chapter 5 Coal and Petroleum

1 mark Questions

1. The slow process of conversion of dead vegetation into coal is called ________

Ans:Carbonization

2.Naphthalene balls are obtained from __________

Ans: Coal tar

3.A petroleum product known as __________ is used for metalling the roads.

Ans: Bitumen

4. Natural gas is stored under high pressure as _________

Ans: CNG

5.__________ is a cleaner fuel.

Ans: CNG

6.---------is used as a fuel in jet aircraft.

Ans: Kerosene oil

7.------- is the petroleum gas which has been liquefied under pressure.

Ans: LPG

8. The major constituent of CNG is ___________

Ans: Metane

9. ___________ is the best known reinforcing agent in rubber industry

Ans: Carbon black

10.The quality of gasoline is generally expressed in terms of _________

Ans: Calorific value

CBSE ADDA: CBSE 8th Science Ch.5.Coal and Petroleum Solved questions

CBSE Class VIII (8th) Science | Chapter 5. COAL AND PETROLEUM
Q. What is Fuel?
Ans: Substances that burn in air to give heat energy are called fuels.
Q. What is Fossil Fuels?
Ans: A Naturally occurring substances that are extracted from the earth crust and also used as fuels is called Fossil Fuels like Coal, crude oil and natural gas.
Q.What is different types of coal?
Ans: 1. Lignite (Brown Coal) contains 25 – 35 % carbon.
2. Bituminous coal (Soft coal)  contains 45 – 86 % carbon.
3. Anthracite coal (Hard coal - It has the highest heat energy) contain 87 – 97%carbon.
Q. How coal is formed ?
Ans: Coal is formed by degradation of wood under the influence of high pressure and temperature over millions of years is called carbonization.
Q. What is destrictive distillation of coal?
Ans: When coal is heated in the absence of air is called destructive distillation of coal.
Q. What are the different products obtain from destructive distillation of coal?
Ans:
Different products	Uses
1. Coal Gas - main constituent are H2,CH4 and CO	As a fuel in cooking food , street lighting
2. Liquid Ammonia	To make fertilizers
3. Gas Carbon	Carbon electrodes in batteries
4. Coke(grayish Black)	As a fuel and as a reducing agent in steel manufacturing, Produce fuel gas like water gas (CO+H2) and Producer gas(CO+N2) For producing Carbide like CaC2,SiC , and Al4C3
5. Coal Tar (black Terry material)	To make plastics, paints,  dyes, naphthalene balls and explosives, Perfumes
Q. What do you mean by  fractional distillation?
Ans: The process of heating a mixture of many liquids having different boiling points and separating them by cooling is called fractional distillation.

Q. How Petroleum and Natural Gas are formed?

Ans: Dead plants and animals buried at the bottom of the sea millions of years ago. They got covered with layers of sand and clay. Due to high pressure and temperature, they got transformed into petroleum. Petroleum is obtained by drilling through the earth. The crude oil is pumped out from a well as a black liquid.

Q. How do various constituents  of petroleum is separated?

Ans:  Various constituents of petroleum are separated by fractional distillation in fractionating  columns is known as refining of petroleum. The various fractions of petroleum obtained are

Fraction	Uses
Petroleum Gas	Fuel for home (LPG)
Petrol	Motor fuel
Kerosene	Fuel for stove and jet aircrafts.
Diesel	Fuel for heavy motor vehicles.
Lubricating oil	Lubrication
Fuel Oil	Fuel for Power Stations and Ship
Paraffin wax	Candles, Vaseline
Bitumen	Paints, road surfacing

Q. How is natural gas formed?

Ans: Natural gas is formed whenever vegetation decomposes in marshes, sewage and in coal or petroleum mines. It is made up of 90 % methane.

Q.What are the main uses of Natural gas

Ans: (a) it is used for producing H2 gas by heating 1250k .

(b) For manufacturing Carbon black that is used in rubber industry as reinforcing agent to make tyre.

(c) For manufacturing Petrochemical and fertilizer

Q. Why natural gas is called an ideal fuel?

Ans:  It is an ideal fuel because

(a) Burn with smoke less flame

(b) Do not leave ash

(c) Having high calorific value about 55kgJ/g

8th Combustion and Flame CBSE Test Paper

Science CLASS – VIII COMBUSTION AND FLAME
Q.1 Name a few fuels used in our homes.
Q.2 Name a few fuels used in trade and industry.
Q.3 What fuels are used for running automobiles?
Q.4 What is the difference between the burning of a candle and burning of a fuel like coal?
Q.5 What is combustion?
Q.6 Define a fuel?
Q.7 (i) What are the essential conditions required for combustion?
(ii) What is the essential condition required for extinguishing fire?
Q.8 What are inflammable substances?
Q.9 In what form is LPG stored in cylinders?
Q.10 Name the most common fire extinguisher?
Q.11 Water is not suitable for extinguishing fires involving electrical equipment oil and petrol. Why?
Q.12 Explain how CO2 is able to control fires?
Q.13 What are the requisites (qualities) of a good (ideal) fuel?
Q.14 Explain the following terms:-
(i) Global warming
(ii) Acid rain

Q.15 Suppose you are asked to boil a given quantity of water using cow dung  cake, coal and LPG as fuels. Which fuel would you prefer? Give your reason.
Q.16 Define calorific value of a fuel. Though hydrogen has got highest calorific value but it is not used as a domestic fuel. Why?
Q.17 Make a labeled diagram of a candle flame.
Q.18 Name various types of combustion. Give example of each type?
Q.19 Differentiate between.
      (a) Combustible and non combustible substances
      (b) Complete combustion and incomplete combustion.
      (c) Luminous and Non-luminous flames.
Q.20 Define the term ignition temperature. Why substances like alcohol and petrol are called inflammable substances? 

VIII:Coal and Petrolium CBSE Test Paper

Q.1 Fill in the blanks:-
(i) On heating in air, coal mainly produces ________ gas.
(ii) ________ is an almost pure form of carbon.
(iii) Coal tar is a mixture of about ________ substance..
(iv) Now a days ________, a petroleum product is used in place of _______for metalling the roads.
(v) ________ is used as a fuel in light automobiles whereas heavy motor vehicles run on ________.
Answer these questions

Q.2 What are natural resources?
Q.3 Give three examples of natural and man-made material?
Q.4 What are the two kinds of natural resources? Explain giving examples?
Q.5 What are fossil fuels? Give three examples?
Q.6 Write two uses of coke?
Q.7 Name four substances which are manufactured using products obtained from coal tar?
Q.8 How is petroleum formed?Q.9 Name three places in India where petroleum oil is found.
Q.10 What is petroleum refining?
Q.11 Write two uses of petrol, kerosene, diesel, paraffin wax and bitumen?
Q.12 Why is CNG being used as a fuel for vehicles?
Q.13 Explain why should we use fossil fuels only when absolutely necessary.
Q.14 What is the full form of LPG and CNG?
Q.15 What are the tips given by PCRA to save petrol and diesel?
Q.16 Why is petroleum called black gold?
Q.17 Give two advantages of natural gas as a fuel.
Q.18 Explain why coal, petrol and diesel oil will be exhausted one day.
Q.19 Write any two ways in which we can conserve fossil fuels.
Q.20 Write three ways in which we can help to meet energy crisis.
Q.21 Why are petrol, coal called non-renewable resources?
Q.22 What are the advantages of using inexhaustible resources of energy?
Q.23 Write the composition of natural gas.

mcq on coal and petrolium for class 8

1. When heated in air produces

a. Carbon monoxide
b. Carbon dioxide
c. Nitrogen dioxide
d. Oxygen

2. Coal is produced in industry to get

a. Coke
b. Coal tar
c. Coal gas
d. All of these

3. Coke is used in the manufacturing of
a. Lead
b. Iron
c. steel
d. Copper
4. Which is an almost pure form of carbon?

a. Coke
b. Coal tar
c. Coal gas
d. None of these
5. The characteristic of coal is

a. tough
b. Black in colour
c. Porous
d. All of these
6. Coal tar has an _________ smell.

a. Unpleasant
b. Pleasant
c. Both (a) & (b)
d. None of these

7. Coal tar is used in manufacture of
a. Synthetic dyes
b. Drugs
c. Explosives
d. All of these

8. Naphthalene balls are obtained from
a. Carbon
b. Coke
c. Coal tar
d. Coal gas

9. Which gas is obtained during the processing of coal?
a. Carbon dioxide
b. Coal gas
c. Carbon monoxide
d. Sulphur dioxide

10 Heavy motor vehicles like trucks run on
a. Petrol
b. Diesel
c. Coal
d. Coal tar

11. Petrol and diesel can be obtained from
a. Coal tar
b. Coal
c. Petroleum
d. Coal gas

12. Petroleum is formed from
a. Domestic animals
b. Organisms in sea
c. Wild animals
d. Insects

13. Petroleum is mixture of
a. Petrol
b. Diesel
c. Petroleum gas
d. All of these

14. The layer containing petroleum oil & gas is
a. Above that of water
b. Below water
c. Between water and sand
d. Below sand

15. Refining is
a. Extracting petroleum gas
b. Separation of various fractions of petroleum
c. Heating of coal
d. Sedimentation of fossil fuel